Rename internal library dart:_collection-dev to dart:_internal.

runtime/vm/isolate_test.cc

Index: runtime/vm/isolate_test.cc
diff --git a/runtime/vm/isolate_test.cc b/runtime/vm/isolate_test.cc
index ee39fb019044533cba4e8f5c4022b37b72da6e2d..2bb21c798c39cc14dbf2c1a71f2ae66829663504 100644
--- a/runtime/vm/isolate_test.cc
+++ b/runtime/vm/isolate_test.cc
@@ -40,7 +40,7 @@ TEST_CASE(IsolateSpawn) {
   // Setup the internal library's 'internalPrint' function.
   // Necessary because asynchronous errors use "print" to print their
   // stack trace.
-  Dart_Handle url = NewString("dart:_collection-dev");
+  Dart_Handle url = NewString("dart:_internal");
   DART_CHECK_VALID(url);
   Dart_Handle internal_lib = Dart_LookupLibrary(url);
   DART_CHECK_VALID(internal_lib);